Air motor and pump



Sept. 30, 1952 w. B. WEIS A-IR MOTOR AND PUMP 4 Sheds-Sheet 1 Filed Feb. 27, 1950 fiTTOR/VEY W. B. WEIS AIR MOTOR AND PUMP Sept. 30, 1952 4 Sheets-Sheet 5 Filed Feb. 27, 1950 Sept. 30, 1952 w. B. WEIS AIR MOTOR AND PUMP 4 Sheets-Sheet 4 Filed Feb. 27, 1950 INVENTOR. WILLIAM 8- El:

Arron/v5).

Patented Sept. 30, 1952 Am MoroR AND PUMP William B. Weis. Detroit, Mich., assignor, by direct and mesne assignments, of ninety per cent to Leah Helpert and ten per cent to Robert A. Sloman, both of Detroit, Mich.

Application February 27, 1950, Serial No. 146,570

This invention relates to an air motor and a novel control mechanism therefor, and more particularly toan air operated motor and pump capable of pumping liquids, particularly oil.

It is the object of the present invention to provide an air motor construction together with a novel valve and valve controlling mechanism whereby upon the application of compressed air the motor will be continuously operating and will automatically reciprocate in view of its positive acting control mechanism, and this motor may be used for many difierent purposes.

It is the object of the present invention to provide such motor and pump for use in draining oil from one enclosure, such as a vehicle crank case, and pumping the same directly into an oil drum or other suitable storage tank.

It is the further object of this invention to provide a device of this type which can be readily :placed within the threaded aperture of an oil drum and mounted thereon, employing a suitable oil drain hose attached to said pump at one end, and with its inlet positioned within the receptacle from which it is desire-d that the fluid or oil be drained.

It is the further object of this invention to provide an air motor and pump together with an automatically operable positive acting control valve mechanism for regulating the direction of compressed air to one side or the other of said motor.

These and other objects will be seen from the following specification and claims in conjunction with the appended drawings in which:

Fig. 1 is a perspective view of the air motor and pump is mounted upon a drum which is fragmentarily shown.

Fig. 2 is side elevational view of said air motor of a slight variation in the construction of the motor and pump housing, and a slight variation in the method of mounting on the drum fragmentarily shown.

Fig. 1.0 is asection on-line- Ill-i0 of Fig. 9.

8 Claims. (Cl. 121-164) Fig. 11 is a section on line HH ofFig. 10; and

Fig. 12 is an elevational view partially broken away and sectioned illustrating the present air motor without the pump.

It will be understood that the above drawings illustrate merely a preferred embodiment of the present invention, and other embodiments are contemplated within the scope of the claims hereafter set out. 4

Referring to Fig.- 1 an oil-drum D is fragmentarily shown having athreaded inlet open-.

ing H at its upper end intowhich the present motor and-pump are mounted. The air motor is generally indicated'at A and the pump attached thereto is indicated atB. The compressed air supply conduit is'show'n at C, there being a suitable petcock E in said conduit and joined to the motor housing as best illustrated'in Fig. 2. The oil drain flexible pipe F has a fitting-20; atone end for connection with the fluid inlet fitting 2| which extends from pump housing B, the opposite end of said pipe being adapted for insertion within the receptacle from" which it is desired] to pump fluid, such as oil from a vehicle crank pumped directly into the case, which is to be drum D.

The downwardly depending legs 29 which extend from pump housing B, as also illustrated in Figure 7, are threaded at 3!) upon their outer surfaces, being adapted for threaded insertion and securing within the threaded'openingllof said drum.

Referring to Figs. '2 and 3 the motor and pump includes the elongated housing l2 with; the central cylindrical chamber l3, said housing having a cylindrical portion M which terminates at its upper end in the flange i5.

Cylinder head [6 is aligned with housing 12 and positioned ther'eover, being firmly secured thereto by'the four threaded studs l9 which extend upwardly through said flange and into cylinder head as shown in Fig. 2.

The air motor includesthe elongated housing l1 and the integral cylindrical head I6 at its lower end, said housing having acentral cylindrical bore 18 which extends from said head throughout the length of said housing.

Fitting 20 on flexible oil hose or pipe F is joined as shown in Fig. 1 tothe inlet fitting 2|, which as shown in Fig. 7 is threaded into. a correspondin openingin the lower end of pump housing [2, there being an-upright passage 25 providing fluid communication from the.-inlet opening 24 in fitting 2| to the pump chamber l3.

The ball check valve 22 is normally maintained by a suitable spring shown in Fig. 7 against the conical valve seat 23 Within inlet fitting 2| whereby fluid such as oil may flow inwardly only, and the action of the pump hereafter described will not deliver any fluid out through fitting 2!.

At the lower. endfofapump chamber [3. 1s a delivery passage including conically shaped valve seat 26 within which is movably positioned the ball valve 21 normally held against said seat by the coil spring which is shown. This ball check valve is within and supported by the fluid I delivery fitting 21' with delivery ope'ningZB;

Piston rod 3| is housed within motor housing H and is adapted for reciprocal movement through a central opening formed through the 1 The air motor includes the bore l8 aswell as I the cylindrical chamber 42 between the upper end of, piston Hand-cylinder headl6 which is provided upon the downward movement of said piston.- such as shown; in Fig.5. The compressed air conduit, and-the petcock E joined thereto is mounted upon, the lower end of housing ll with'the-threaded outlet 43 of said petcock positioned within; the corresponding; threaded opening 44.formedzjwithinthe cylinder head I6 as shown in Fig. Said opening terminates inthe compressed air supply passage -45 which is adapted to supply compressed air alternately to either of thepas sa es. 46 or 41,.passage 46 supplying; compressedain to chamber 42 and pasa e 1 'bei gadapted u y co pr r to bore 18.; e

Compressed air delivered through passage 46' operates upon thelower-piston 38 for effecting downward movements thereof .withinthe chamher l3 of-the pump I 2, and this downward movementisadapted to pump thr ugh the action'of said piston'iiuid or oil from the interior of chamber I 3 through the fluid outlet fitting 21'xand directly into the iiuid drum, said fitting'being centrally positioned with respect to the=opening H in the top of said drum.

There is also an exhaust passage formed within the cylinder head I6 whieli is adapted for alternate communication with either of the. chamber exhaustjpassa'ges 48 and, depending upon the positioning. of the rockable valve element 5| shown in Figure 5, When compressed air is supplied from passage 45', through valve groove 52 and through passage 46 into chamber 42 to eflTectdownward movement aorpiston 38, then exhaust :-from v bore [8 under, the downward action" of piston-52 isfcrced' throughithe' passage; 49',-valve groove53 and out through theexhaust passage 50. With the valve 5| rotated'toithe dotted line position 5| shown in Figure"5"th e flow is reversed with -coinpressedair being sup;- plied through groove 52 an(i"passage 4'! up into bore" I 8,- and with exhaust "from chamber 42 under the upper; action of piston; 38' projected through passage 48, valvegr'oove 53 Y and exhaust passageio.

Figure 4 illustrates the construction of the valve 5| and its positioning within the cylinder head l6. The valve 5| with the grooves 52 and 53 upon opposite sides thereof, is generally conical in shape, and is adapted for positioning adjacent the conical seat 54, with the valve stem 55 projecting -"iro n valve? 51 and transversely thru'cyIindenhead-JB. Y, I

The thrust screw 56 is threaded into cylinder head I6 for cooperative retaining engagement againstthe outer end of valve 5| normally maintaining the'same in relation to its seat 54, there being provided a suitable lock nut 5'! for securing said thrust screwgvinthe desired adjusted posistion relativelto said:valve.

The opposite reduced threaded end 58 on valve stem 55 extends beyond cylinder head 16 and hassecured'thereto'the crank 59 by means of the nut=601and the lock nut 6!. A central circular opening 62 is formed within crank 59 as shown in Figure 2, being adaptedto cooperativelyreceive the transverse. stop pin 631which is secured within" a lateral opening, in said u cylinderhead and which projects into the circularopening 62 of saidcrank to liinitits pivotal movements.

. Transverse pin 64 v is riveted-or otherwise suite ably secured tothe outer end of crank: 59, anda corresponding pin 65 'projects outwardly from the rockable disc -66lin substantiallparallel re-- lation, there being-a. suitable. coil-springs? in-. terposed between and interconnecting the two pins 64 and 65; H I

Therockable disc. 66' is generally semi-circular in form, including. theimovement limitingor stop surfaces 6'! and .6 8 .which' arejl. also. adapted for intermittent cooperative registry. with the stop pin 63 as shown inFigures 2- andfllv 'The control disc 66 is centrally-secured"upon. the outerend of the crank 59 to assure movement; in unison between said crank and valve stem.

Rotatable pinion 'lflis' loosely housedflwithin the transverse circular opening 69 incylinderlheadi. I 6 andis inmesh atI'all-times'withthe. gear teeth. which form a part of'the' rack. gear 13Ion one. sideof the ve'rtically'reciprocalshaft '12; as shown in Figures 3, 4 and 6.

Thus it is apparent that vertical movements of the shaft 12 Wi11' affectrcstary movements of the pinion 76 in onedirectionor thev other, this in turn effectinga rocking] nio'jvement inone direction of the'othe'r of the control "disc 66,

joined to the. crank 59 by. the coil spring. 66'. As will be apparent from Figure 2 initial. rocking movement in one direction of the disc'.6 6 from the position shown in Figure'z in engagement.

with the pin 63, will have no effect upon the position of the crank 59Iuntil the' P11165011 said disc passes dead centerrelation withrespectito pin 64 and the pivotal mounting point58ot crank 59.

After the pin 65 passes said dead center the... spring 65' will be efiective to move the crank'59" from a position'shown in Figure -2 upwardly in a clockwise direction until the boundary of the circular opening GZ re-engagesthe pin 63. upon its opposite side:

limited when the surface 61-is'"in engagement with: pin 63. Thus-thereis provided a novel control valve .55! which determines to' .-wh ich hepis o ie erne ra l "its downward stroke,"a'fter winch said valve will i mechanisl'n fon obtainingfa quick and positive action of the-crank. 59 .and the valve to which.- it

'aeianas 'is"connect'e'd; *O'n'a' movement. of the rack supporting shaft 12 in itheoppositerdirectionz itis' apparent that :the .pinion loosely mounted around valve stem 55;: .will'l.rock"'in'theiopposite,direc- I tlon causinguachange in the dlrection-of'movementvof the disc 66.; There againthediscgwill not betefiective to change. the positioniofg the crank .59junti1 the. pin :65. on said discpassesxbeyondhdead'. center; orrin :other words passes fibe- 'yond .a lineilextending between the pin '64. and

the mountingipoint, 58 of, said crank:

I 'Referring j,to.;F 'igure; a 'it,.wil1 be; seamin rackaoperating. shattglziis inits uppermost position,.saidashaft being slidably positioned through ;a,l .corresponding;o openingin the cylinder, head.

substantially paralleLwith piston rod 3 l... Shaft 12,..mere1y .floatslwithin the opening in cylinder head I I 6:;and is moved i upwardly by the .;upward movement'of thelpistonlassembly .38 to theposibexquillklyfihan ed. Over so ii-ha the m re e airasolircesis delivered to ,chanlber ;l8-onthe under sidefofzpistonrassembly. 32. -,,;Thereiore it is pos- SiblextQzfieull .a'. continuous. e p ea1 v e or the twolpistonscwit nthe r e pectivechamhers, I. t. g During the upward movement of piston: assemlol l 38.011 will be drawn; nto. theru n ham r 43 from the;,c0nd,uit-:F;.-bfl1 s lve 27 in prin closed.eAncrzupon; the d wnwar emen pl-smessemm ;-e.sil;n ..fluld w thi eha ber 1. w l. '.-pu pe l:.-.;o t t the fi g. i.

throlighcthegopening 28 therein, dropping down into .thesinterioriofdrum D int ma n Shown in: Figure 1 ball .valve122' being closed. 1 i In other words chamber l3 may beregarded-asa pumping .tchamber, whereas the two chambers l8 and llamayibe. regarded as he enerai eehe b e- .tionshowninFigure 3,.being the uppermostposition' of said shaft, and the; rack carried thereby.

-;Up on; downwardmovement of: the piston assembly-,32, it will be seenthattheshaft J2=Wi1 remainjstatlonary.until the ;piston has travelled almost its "complete path-of movement. ;As it reaches the lower end. ofv chamber .l8-,saidvpiston. assembly bears downwardly vupon ,therackopcrating, shaft 72 ,mov ing;.the same downwardly corresponding tothe lowermostpositionwof the piston assembly, 32..., and with the lower end of ;'shaft 12 projected-below cylinder headlfi to "a s mbl and the onding end o t seek perating. sn l-1.11. it s, a aren e a I rea r portion cf l l e motion of said pistons will have he f c uleenthe s f F ore; t initial downward or upward; move rnent of said shaft l nden theaction of 'either of the piston. 'ssinp ies, while t initiates a rocking move-.

. ment of thecontlfloldisc .65; will still be ineffective to operate-or change 'the'positioning "of the cylinder or; charhber'compre'ssed air is to be; supplied." n is; onlyl' a'fter' the disc as and t em 65 carriedv thereby has rocked slightlyip'ast1. the deadcenter' position above described that there will be any'actio'n of, the crank 59, and thi's'ac tion will be a} quick snap; action providing for positive change inthe position of "the valve 5i from'one control position to the other. j In other'fwords under the action of the spring 66', the-crank 59' is adapted for a quick snap action from oneposition of control to the opposite position of control, with both movements being limited by the projection of the pin 63" into the enlargedcircular opening 62 of said crank. With'the crank keyed to the valve stem 55 inthe manner shown in FigureQB it also followsthat the valve 5| will be positive acting-and will-change quickly from one position of control to the other. Therefore, this valve is effective to control the flow'intermittentlyfrom chamber I 8 to chamber 42;"and 'controltheexhaust flow from chamber 42"or from chamber Hi. In other words con pressed'airrwillb supplied to chamber-132 until Co p s d 'air.. i.s..supp1ied n e t nt v to e chambers 18 .and42 to thereby produce the pumpin actio ithe i ena s bl 33-.

; R fer n to. fi ur ft awi there hasgbeen a slight change in the presenternbodi- .ment of the inventiom wherein the block Hi ls thr ad d at. its, low r n a J? andjprei e e d wnin nthe t eade spie -"line mm t of .t-he,,drum-.D-v., .j

B ck 1% isibe t reee ve; h in e fittin QI .wh ch... he mele nst e i as-th r w h It be l ch k th bl "fit h ehi e th ls eleqn tie a at he in Figure} and which also includes the 'one -way ball checl; valve 21. Flllid drawn in through the ttin 2! -ent h pum in ehembe 3 thro gh. simi ar i. ease! I nd; down- Wa d: m mee -Q e...n t n' ss mb y Said wardlyfthroughfthe downi d -ext ndi the utletfitfine-ifi l s nstead h.e... n loeih n 1: shownin Figure 3; l ere -,'is .provideda hollow e n rie lewal 19: Pre ably. .eo r e d fa nslearent apla s bst ce stilLd fi g t p m i mbe 1.3. therei t e es tive pos te n of a ".e hndri eLWaH operatively joined to t e-bl c ge and to the lowiere d o t e. c lin er adii whic form a zpa tof th ..h u in i II --;As shown in Figures 10 and Lia-plurality of tie rods 8.0;}are employed which".proJect upwardextends through the cylinder head and upon.

one-end of said rod is mounted a'piston assembly 86; and upon itsother end a piston'assembly 81.

The": same: control mechanism above described withr'espect' to Figures's and 4 is employed with- I in the"cylind'rical housing 84 foh-efiec'ztin'g rehas practically-com leted 'ciprocalflnovernents or d'fli s ei i y Howeveninstead ofacting as a pump thereare pr'ovidedupon'opposite ends of the respective I s'sage s and thence through thepiston assemblies ,86

aeremrs' 'piston-assemhlies the roas -s8 and 9 L Rodm'with a suitable connec'tor or transverse opening 589 at its outer end, is "joined to the piston assemblyc 86 as-by the-nut 90. On the other hand ther rod r9| with transverse opening "92 at outer end is joined to the reciprocal piston assembly 8l as by the nut 93. I I r I Thus there is shown in Figure 121'anzair motor which is operated in the identicahfashion as the air motor described with respect- 1:0 figures 1 through 11, with the exception thatthepumping device has been eliminated. --Inother-'wordS,'-reciprocal movement of the pistons is-adapted 't0 effect reciprocal 'movementof the two extension rods8'8and '91, which movements maybe utilized for various purposes.

Having described- "my invention reference should now "be had to the claims v--' whieh i'follow for determining thesc'opethereof. 'I claim: I I II 2 1. A fluid motor comprising a hollow elongated housing having a vcentral cylinder -head 'defining chambers upon opposite sides thereof, a recip- 'rocal rod extending through saidhead-an'd carrying pistons upon opposite 'ends'thereof j-wi'thin said housing," a pressure fluid source jo'inedto said head, said head having passages therein for receiving and exhausting pressure fiuid 'and for delivering and exhausting pressure-iluid'to and from each of said chambers respectively, a

rockable' valve having an elongated stem iournaled within said head and -projecting froinasaid housing, said valve being grooved for controlling through said passages "respectively the -"fiow of pressure fluid-to one-chamber*and-exhaust'from the other chamber, andadapte'd upon :movement "to reverse said pressure-fluid and'exhaust'from one chamber to the otherga pivoted crairik joined to said valve Stern on the exterioro'f said housing for intermittently rocking said Waive, a' -longitudinally reciprocal shaft, spaced "r'rom said' rod and extending through said head and outwardly therefrom with its opposite ends adapted "for alternate engagement and "movement with said pistons, and control means on-saidhousirig iin- "terconnecting said snare and; the 'Ire'e enfd of trol movements of said valve.-

said crank to efiect'au'toma'tic intermittent'oon- 2. A fluid motor comprising a hollow-elon'gated housing having a central cyli-n'der hea'd defining chambers upon opposite sides thereof, a reciprocal rod extending through saidhead and carry- -ing--pistons upon opposite ends thereof' w-ithin said housing, a pressure i fluidisourceizjoined 7.150

said head, said head having passages Tthereinffor receiving and exhausting pressurerfiuidianrliifor delivering and exhausting pressure :flnidttotand from eachof said chambersirespectively aarockable valve having an elongated stemijourrraled within said head and projecting t'fromzsaid. housing, said valve 'beingsgrooved for "controlling through said, passages respectively :the glow of tudinally reciprocal rshaft spaced =from--;said- :rod and-extending through "said head-and outwardly .therefrom'vvith its opposite.ends adapted for alternate engagement and movement with said pistons, a rackgear on said shaft-aqpinion .-in mesh therewith and loosely-journaled-- within rel s es? a d efl t s mus n a control means :on the .,exterior of zsaidlhousine interconne'ctingrsaid pinionand the free end .of

said crank-Ito effectzautomaticintermittent"con- 'trol': movements or; said :vailve;

- 3cm: fluid :motor" nom'prising :a hollow elongated housing :having a, central .cylinderhhead :defining I I delivering and exhausting pressure 1' fluid :to and 'from each of. said :ch'ambersrespectively a rockablel valvei'having an elongated stem journale'd Within said .head and projecting from saidhous:

Y ing, said valve being -grooved for controlling,

through seiid pa'ssages respectively the :flow of pressure fiuid to one'chamber and exhaust from the :other chamber, and adapted upon movement to rever'se said pressure fluid and exhaust from oneichamber 'to the other, a pivotedcrank joined to :said' valve stem "on the exterior of jsaid ihou sing :for intermittently rocking said valve, 'a longitudinally reciprocal' shaft spaced from said rod and extending throu'gh said head and outwardly therefrom with its opposite" ends adapted for alternatefiengagement and mo'vem'en't with said pistons; v et; "gear 'ojn":said shaft, a pinion in mesh therewith 'and loosely journaled-within-said head and projecting" from said housing, a rockable control disc on the exterior of 'saicl hou'sing secured to said pinion, "and resilient control means interconnecting said disc and the free end of said crank for I effecting-automatic intermittent control movements-bf said val've.

4. A fluid motor 'comprising'ia hollow felongated- -housing having'a central cylinder head defining chambers upon opposite :sides' thereof, a reci procal rod extending through said head and-carrying pistonsupon opposite ends thereof within said housinga pressure iiuid source joined to receiving andfexhausti-ngpressure fluid and for' said' head, said head having passages therein for 'deIiVerihg and exhausting pressure "fluid to and fromea'ch ofsaid chambers respectively, a rockable valve having an elongated stem journale'd within said head and projecting from said housin isaid valvebeing grooved for controlling through said tpassages' respectively-the flow of pressure fluid to one cha mber and "exhaust from the other chamber, and adaptedupon movement "to, reverse. saidv pressure fluid and exhaustfrom one end joined to the freefend of saidcrank and withitsother end joined .tosaid disc for effecting automatic intermittent positive control movements of said valve.

5, Afluid motor comprisinga hollow elongated housing having a central cylinder vhead defining chambers upon opposite sides thereof, a .reciprocalrod extending through said :headandcarrymg -pistonsupon opposite .e dsllthereof within a w heu ina a rm si i a-ftm -i mim i said head, said head having passages therein for receiving and exhausting pressure fluid and for delivering and exhausting pressure fluid to and from each of said chambers respectively, a rockable valve having an elongated stem journaled within said head and projecting from said housing, said valve being grooved for controlling through said passages respectively the flow of pressure fluid to one chamber and exhaust from the other chamber, and adapted upon movement to reverse said pressure fluid and exhaust from one chamber to the other, a, pivoted crank joined to said valve stem on the exterior of said housing for intermittently rocking said valve, a longitudinally reciprocal shaft spaced from said rod and extending through said head and outwardly therefrom With its opposite ends adapted for alternate engagement and movement with said pistons, a rack gear on said shaft, a pinion in mesh therewith and loosely journaled within said head and projecting from said housing, a rockable control disc on the exterior of said housing secured to said pinion, and a, coiled sprin with one end joined to the free end of said crank and with its other end joined to said disc for effecting automatic intermittent positive control movements of said valve, the connections of said spring with said crank and disc with respect to a common center being such that said disc will move said valve from one control position to another only after the disc connection with said spring passes dead center with respect to said common center and the crank connection with said spring.

6. A fluid motor comprising a hollow elongated housing having a central cylinder head defining chambers upon opposite sides thereof, a reciprocal rod extending through said head and carrying pistons upon opposite ends thereof within said housing, a pressure fluid source joined to said head, said head having passages therein for receiving and exhausting pressure fluid and for delivering and exhausting pressure fluid to and from each of said chambers respectively, a rockable valve having an elongated stem journaled within said head and projecting from said housing, said valve being grooved for controlling through said passages respectively the flow of pressure fluid to one chamber and exhaust from the other chamber, and adapted upon movement to reverse said pressure fluid and exhaust from one chamber to the other, a pivoted crank joined to said valve stem on the exterior of said housing for intermittently rocking said valve, a longitudinally reciprocal shaft spaced from said rod and extending through said head and outwardly therefrom with its opposite ends adapted for alternate engagement and movement with said pistons, a rack gear on said shaft, a pinion in mesh therewith and looselyjournaled within said head and projecting from said housing, a rockable control disc on the exterior of said housing secured to said pinion, resilient control means interconnecting said disc and the free end of said crank for effecting automatic intermittent control movements of said valve, and a stop pin projecting from said housing cooperable with said crank and disc to limit their pivotal movements.

7. A fluid motor comprising a hollow elongated housing having a central cylinder head defining chambers upon opposite sides thereof, a reciprocal rod extending through said head and carrying pistons upon opposite ends thereof within said housing, a pressure fluid source joined to said head, 'said head having passages therein for receiving and exhausting pressure fluid and for delivering and exhausting pressure fluid to and from each of said chambers respectively, a rockable valve having an elongated stem journaled within said head and projecting from said housing, said valve being grooved for controlling through said passages respectively the flow of pressure fluid to one chamber and exhaust from the other chamber, and adapted upon movement to reverse said pressure fluid and exhaust from one chamber to the other, said valve being cone shaped, and a thrust screw adjustably extending into said head and having an arcuate inner portion retainingly engaging said valve.

8. A fluid motor comprising a hollow elongated housing having a central cylinder head defining chambers upon opposite sides thereof, a reciprocal rod extending through said head and carrying pistons upon opposite ends thereof within said housing, a pressure fluid source joined to said head, said head having passages therein for receiving and exhausting pressure fluid and for delivering and exhausting pressure fluid to and from each of said chambers respectively, a

rockable valve having an elongated stem journaled within said head and projecting from said housing, said valve being grooved for controlling through said passages respectively the flow of pressure fluid to one chamber and exhaust from the other chamber, and adapted upon movement to reverse said pressure fluid and exhaust from one chamber to the other, a pinion rotatably journaled on said stem, a reciprocal rack gear extending through said head and outwardly therefrom with its opposite ends adapted for alternate engagement and movement with said pistons, and spring means interconnecting said pinion and said valve for effecting intermittent control movements of said valve.

WILLIAM B. WEIS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Hollander Apr. 

